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Updated: Aug 19, 2026
Ex Vivo Imaging of Postnatal Cerebellar Granule Cell Migration Using Confocal Macroscopy
Published on: May 12, 2015
Effects of deltamethrin on granule cell migration during postnatal development of rat cerebellum
1Neuroscience Centre, School of Studies in Zoology, Jiwaji University, Gwalior 474 011, India. nishapatro@rediffmail.com
Insights
Exposure to deltamethrin (DLT) during development delayed and disorganized radial glial fibers in rat pups. This impaired neuronal migration, potentially affecting brain development.
Area of Science:
- Neuroscience
- Developmental Toxicology
- Neurodevelopmental Disorders
Background:
- Pyrethroid insecticides, like deltamethrin (DLT), are widely used, raising concerns about potential neurodevelopmental effects.
- Radial glial fibers are crucial scaffolding elements guiding neuronal migration during brain development.
Purpose of the Study:
- To investigate the impact of early-life deltamethrin (DLT) exposure on the development of radial glial fibers and subsequent neuronal migration in rat pups.
Main Methods:
- Albino rat pups were administered deltamethrin (DLT) intraperitoneally (0.7mg/kg/day) during postnatal days 9-13.
- Histological examination focused on the appearance, organization, and morphology of radial glial fibers in the cerebellum.
Main Results:
- Deltamethrin (DLT) exposure resulted in a delayed appearance of radial glial fibers.
- Treated rat pups exhibited disorganized, hypertrophied, and heavily stained radial glial fibers.
- Neuronal proliferation appeared normal, but migration was likely hampered by aberrant glial fibers.
Conclusions:
- Early-life deltamethrin (DLT) exposure disrupts the development and organization of radial glial fibers.
- This disruption impairs the migration of granule cells, potentially leading to neurodevelopmental abnormalities.
- DLT's neurotoxic effects may involve interference with neuronal migration pathways critical for proper brain formation.
Abstract:
Deltamethrin (DLT; 0.7mg/kg/body wt/day, i.p., dissolved in propylene glycol) administration during postnatal days 913 in Albino rat pups, resulted in a delayed appearance of radial glial fibers, that guide the migration of granule cells. Moreover, the radial glial fibers in the DLT-treated pups were disorganized, hypertrophied and heavily stained. Thus, it is being proposed that although after exposure to DLT the neuronal proliferation occurs at normal rate, the neuronal migration along the stumpy and crumpled radial fibers hamper the journey of the healthy neurons to their proper destination.
